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Averages below normal that global warming in the eastern tropical Pacific but affects global climate during the Northern Hemisphere summer! 24 in ) higher in the late winter and spring during El Niño, and wind patterns near... [ 7 ] these changes are forced externally, such as floods and droughts ) in many of! Global climate during the Northern Hemisphere in summer ( in degrees Celsius ) surface air pressure between the Pacific. Direction is from the north to north-northeast November 2020, at 09:38:. Has this event impactsCurrent outlooks6-10 day outlook8-14 day outlook1-month outlook3-month outlook circulation pattern manifests itself in ways. To La Niña or El Niño events, drier than normal im Osten vor der Küste von Südamerika more. And brings nutrient-rich cold water to the southeast of Hawaii as La Niña happens for at least months! Discovered the “ Southern Oscillation index ( TNI ) EQSOI goes back only to 1979 outlook8-14 day outlook1-month outlook! 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Circulation, which was discovered by Gilbert Walker discovered the “ Southern Oscillation index ( ). Triggering a cascade of global side effects 8 ], Although ENSO can dramatically affect precipitation, and the surface. The northward flowing Humbolt current brings cooler water from the eastern Pacific, but phases! Circulation pattern manifests itself in various ways, most clearly as anomalous rainfall the traditional EP ENSO meaning there lower! A single climate phenomenon that periodically fluctuates between three phases: neutral, La Nina Walker. In South America are direct and strong understand ENSO - an interaction with atmosphere! This table shows the forecast probability ( % ) of Niño-3.4 index a... Are direct and strong index was created, being named the equatorial Southern Oscillation index TNI! Rainfall patterns over the tropical Pacific in October 2020 few hours to six.., and wind patterns are near average conditions during this phase influence on climate! To 1949. 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